Slidell Threshold Days by Year (USC00418378)

5 fixed thresholds counted per year at Slidell (USC00418378): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Slidell Thresholds

Slidell: days with 10 mm (0.39 in) or more of precipitation in 50 years, most in 1997 with 46.
Slidell: days with 25 mm (0.98 in) or more of precipitation in 50 years, most in 1990 with 24.
Slidell: days with 50 mm (1.97 in) or more of precipitation in 44 years, most in 1957 with 7.
Slidell: days with 100 mm (3.94 in) or more of precipitation in 19 years, most in 1981 with 3.
5 fixed thresholds have at least one qualifying day at Slidell.

Days with 10 mm (0.39 in) or more of precipitation

50 years with a qualifying day

Days per year at Slidell with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 46 in 1997.

Days with 10 mm (0.39 in) or more of precipitation per year at Slidell
Year	Days	Decade average
1948	14	22
1949	30	22
1950	27	24.9
1951	21	24.9
1952	23	24.9
1953	24	24.9
1954	20	24.9
1955	24	24.9
1956	20	24.9
1957	39	24.9
1958	25	24.9
1959	26	24.9
1960	29	25.6
1961	25	25.6
1962	26	25.6
1963	16	25.6
1964	27	25.6
1965	28	25.6
1966	25	25.6
1967	20	25.6
1968	34	25.6
1969	26	25.6
1970	25	27.4
1971	28	27.4
1972	17	27.4
1973	39	27.4
1974	24	27.4
1975	30	27.4
1977	25	27.4
1978	23	27.4
1979	36	27.4
1980	25	31.9
1981	40	31.9
1982	34	31.9
1983	33	31.9
1984	34	31.9
1985	31	31.9
1987	28	31.9
1988	27	31.9
1989	35	31.9
1990	44	35
1991	36	35
1992	36	35
1993	32	35
1994	40	35
1995	29	35
1996	31	35
1997	46	35
1998	29	35
1999	27	35

For each year, a bar from the first to the last day at Slidell meeting 10 mm (0.39 in).

First to last qualifying date each year at Slidell
Year	First date	Last date
1948	1948-02-12	1948-10-10
1949	1949-01-23	1949-12-09
1950	1950-01-13	1950-09-19
1951	1951-02-14	1951-11-27
1952	1952-01-03	1952-12-30
1953	1953-03-09	1953-12-03
1954	1954-01-15	1954-12-29
1955	1955-01-10	1955-12-01
1956	1956-01-18	1956-12-20
1957	1957-02-01	1957-12-25
1958	1958-01-13	1958-11-28
1959	1959-03-26	1959-12-17
1960	1960-01-01	1960-12-31
1961	1961-01-07	1961-12-05
1962	1962-02-23	1962-12-02
1963	1963-04-06	1963-12-11
1964	1964-01-16	1964-12-10
1965	1965-01-02	1965-12-11
1966	1966-02-09	1966-12-16
1967	1967-02-12	1967-11-10
1968	1968-01-18	1968-11-28
1969	1969-01-30	1969-12-29
1970	1970-02-01	1970-10-24
1971	1971-01-04	1971-12-15
1972	1972-03-24	1972-11-18
1973	1973-01-03	1973-11-25
1974	1974-01-19	1974-12-11
1975	1975-01-31	1975-12-25
1977	1977-01-09	1977-11-08
1978	1978-01-12	1978-12-31
1979	1979-01-11	1979-12-29
1980	1980-01-21	1980-12-09
1981	1981-03-01	1981-11-30
1982	1982-01-22	1982-12-27
1983	1983-01-01	1983-12-16
1984	1984-01-09	1984-12-31
1985	1985-01-01	1985-12-01
1987	1987-01-09	1987-12-26
1988	1988-01-07	1988-12-23
1989	1989-01-26	1989-10-30
1990	1990-01-17	1990-12-16
1991	1991-01-10	1991-12-22
1992	1992-01-15	1992-12-15
1993	1993-01-02	1993-12-23
1994	1994-01-11	1994-12-29
1995	1995-01-23	1995-12-19
1996	1996-01-18	1996-11-29
1997	1997-01-06	1997-12-24
1998	1998-01-04	1998-12-20
1999	1999-01-02	1999-12-12

Every Fixed Threshold

Fixed thresholds at Slidell
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	50	46	1997	27
25 mm (0.98 in): Days with 25 mm or more rain	50	24	1990	11
50 mm (1.97 in): Days with 50 mm or more rain	44	7	1957	3
100 mm (3.94 in): Days with 100 mm or more rain	19	3	1981	1
10 cm (3.9 in): Days with 10 cm or more snowfall	4	1	1951	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1948.

Download the Data

Data for Slidell threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Slidell Threshold Days by Year (USC00418378)

Key Facts for Slidell Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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